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Triac Ramp Up & Down Circuit

Discussion in 'Power Electronics' started by Sparky1221, Oct 3, 2018.

  1. Sparky1221

    Sparky1221

    1
    0
    Oct 3, 2018
    Need help designing a circuit that will automatically ramp up/down a triac based on input voltage change to a triac trigger pin. See input voltage and output voltage plots.

    This will be used to control a triac for a motor. Would like to have a soft start (ramp up) on initial startup and the ability to ramp it down to say half speed by changing the triac's trigger voltage.

    Any ideas?
     

    Attached Files:

  2. kellys_eye

    kellys_eye

    4,281
    1,144
    Jun 25, 2010
    This is usually achieved by pulse modulation of the gate. Google ''slow start" circuits.
     
  3. Bluejets

    Bluejets

    3,518
    713
    Oct 5, 2014
    If on AC then a diac.
     
    kellys_eye likes this.
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